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D.- A. GREENE. CIRCULAR SAWIN-G MACHINE.

Patented'Mar. 16, 1886.

(No Model.)

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UIRUULAR SAWING MAGHINE.

No. 337,947; Patented Mar. 16, 1886.

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UNITED STATES PATENT @EETEE.

DARWVIN A. GREENE, OF NEW YORK, N. Y.

CIRCULAR SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 337,947,61atec'l March 16, 1886.

Application filed October 2, 1885. Serial No. 178,839.

To all whom it may concern.-

Be it known that I, DARWIN A. GREENE,

of New York city, in the county and State of New York, have invented a certain new and useful linprovement in Sawing Machines, of which the following is a specification.

The improved machine is intended more particularly for sawing waste wood, edgings, and the like into short lengths for kindlings. Iwill describe it as thus used, though it will be understood that it may be employed to treat any kind of lumber in reducing it to short lengths for any purpose.

I employ a series or gang of circular saws, all of the same or about the same diameter, and mounted on a single shaft. I feed the material to the gang of circular saws by aseries or gang of feed-chains adapted to receive the irregular material and carry it to and past the saws, the motion being in the same direction as the saws during the operation. I employ clearing-fingers to perform the obvious functions of clearing the sawed material from the saws. I make these fingers adjustable to accommodate to the different sizes as the saws become reduced in diameter. The feed-chains are mounted on drums equivalent to sprocketwheels, and are held down by peculiarlyformed guides. I control the feed by belttightening mechanism peculiarly adapted for convenient operation. A crank or toggle lever is thrown a little past the center to hold the belt-tightener reliably out of action without other fastening. \Vhen thrown in the opposite direction, the belt-tightener acts yieldingly against the belt with the force due to a weight. I provide for adjusting the feedchains at different levels as the saws become reduced in diameter. I provide unusual facilities for conveniently removing and replacing the saws. The saw-arbor is supported in three bearings. Two are permanent and will sustain the weight of the shaft and hold it correctly in position when the third is removed. This allows the saws to be taken off and sharpened and replaced, or one set of saws to be exchanged for another with great facility. The removable bracket supports the sawarbor firmly when the work is being performed.

The accompanying drawings form a part of this specification, and represent what I (No model.)

consider the best means of carrying outthe invention.

Figurel is an end elevation. Fig, 2 is a corresponding view showing the bearing in which the back-drum shaft revolves and on which the frame carrying the other drum and associated mechanism is fulcrnnied to allow of being raised and lowered. Fig. 3 is a plan view corresponding to Fig. 2. Fig. 4is a vertical section corresponding to Fig. 1. It is a section on the line x w in Fig. 7. Fig. 5 is a detailed view of the clearer-lever and its attachments, seen at right angles to the view in Fig. 4. Fig.6 is a rear elevation partly in vertical section. Fig. 7 is a plan view partly in horizontal section. Fig. 8 represents certain portions in side elevation. Fig. 9 is a corresponding plan view. Fig. 10 is a side elevation showing certain parts detached. Fig. 11 is a plan view of the lever, ratchet, pawl, and one of the bearings and tumblingarms and connccting'rod for raising and lowering the frame carrying the feed-chains. Fig. 12is a side elevation of certain parts corresponding to Fig. 11. Fig. 13 is a plan view and side elevation of one of the guard-irons that lie over the feed-chains. Fig. 14 is an under or back view of one of the feed-chains. Fig. 15 is a top view or face view ofthe same.

Fig. 16 is a cross'section on the line 2 z in 7 Figs. 14 and 15.

Similar letters of reference indicate corresponding parts in all the figures where they occur.

A is a fixed frame-work, of hard wood, certain portions of which will be designated when necessary by additional marks, as A, &c., cast-iron brackets A, permanently fixed, sustain in suitable boxes or bearings the sawshaft B,which receives through a pulley, B, strong and rapid rotary motion from a belt, 0, driven by a steam-engine or other suitable power. Aisacorrespondingbrackctsecured on the opposite side of the frame by easily removable fastenings a".

D D are circular saws mounted on the shaft B, firmly spaced by thimbles D, and se cured by strong pressure laterally induced by a.- nut, D", which matches on a screw-threaded portion of the shaft B. Removing the fastenings a liberates the bracket A, on reinov ing which the nut D may be removed and the thimbles D and saws D may be taken off by an endwise movement. This provision is important in view of the frequent sharpening necessary in rapid sawing of rough material in the presence of dirt and grit.

E is a shaft mounted in fixed bearings, and controlled by alever, E, and a pinching-screw, E, which screw engages in a curved slot, a, in the fixed framing. series of fingers, E which stand betweenthe saws D and insure the clearance of the wood from the saws. Adjusting thepinching-screw E in different positions in the curved slot a correspondingly changes the positions of the clearing-fingers E. This allows the fingers to be conveniently shifted inward toward the axis as the saws decrease in diameter by successive sharpenings and allows them to be easily shifted outward to allow the saws 'to be removed and replaced.

G is a movable framing, which carries the feed mechanism. One end is mounted on the shaft F, which is carried in fixed bearings A".

(See Figs. 2 and 3.) The other end is raised and lowered by means of links H, which connect to arms I from a rocking shaft, I, mounted in fixed bearings and operated by a hand-lever, 1.

J is a pawl turning on a fixed center on the framing, adapted to engage in teeth in aratchetwheel, P, fixed on the shaft I. By the lever I and the holding-pawl J the framing G may be raised and held in any required position. The free end of the framing G carries a shaft, E, which is raised and lowered therewith. Each shaftF and F carries a five-sided drum,K.

M M are pitch-chains, which serve as feedchains to carry the wood to the saws. They are made in uniform links, the length of each link between centers coinciding with the breadth of the faces of the drums K. The feed-chains are arranged to match the saws, one feed-chain, M, in each space between each saw D and the next. The feed-chains are parallel. The links are connected by trans .verse cylindrical bolts M. The exteriors of the several links are notched, as indicated by m. These notches engage with the wood and hold the material sufficiently to present it to the saws as the work proceeds.

The central portion of the framingG carries atable, G,which firmly supports the feedchains M as they move with their wood past the saws.

It is' important that the feed of the wood may be stopped and started promptly without necessitating the stoppage of the saws.

K is a gear-wheel fixed on the drum K. It engages with a smaller gear-wheel, O, fixed on a transverse shaft, 0, which is supported The shaft E carries a the shaft S, which in turn receives motion through a large pulley, S, and a belt, S ,;from a small pulley, B on the saw-shaft B. This train of .mechanism gives the proper slow feeding motion to the feed-chains M whenever the feed-belt Q is ti htened.

The arrows show the direction of the motion of the gang of saws and also of the gang of feed-chains.

. 7 There is a tendency of the wood to be fed and preventing any chips, bark, sawdust, or getting down into and under' the like from the chains.

L is a shaft mounted in bearings in the framing G, controlled by a lever, L,'adapted to be turned by hand; It carries an arm, L, which supports a stud or pin, L, on which is a tightener-pulley, L. An arm, L fixed on the shaft L, connects a curved link, N, which performs important functions.

G are brackets extending downward from the framing G, and carrying a transverse shaft, P, on which is pivoted a lever, P, carrying a weight, 1?. The link N connects to a pivot,

P, on this lever P. The gravity ofthe weight Purges the tightener-pulley L up into a yielding contact with the feed-belt Q. yields to accommodate all irregularities.

The feed may be instantly stopped by turning the lever P in the direction todrop the tightening pulley L, thereby raising the weight P". Thegravit-y of P opposes this movement at first, but the arrangement is such that the movement finally carries the link N past the dead-center, leaving itin such position that the gravity of the weight P 'contributes to hold itself up and to hold thetightener down out of use. It will thus remain out of use as long as desired, ready to instantly take hold again on the reverse movement of the lever P.

The adjustment of the height of the framing G by operating, the lever l carries with it the entiretrain of feed mechanism. These parts are always in correct adjustment relatively to each other. mechanism may be raised with great nicety as the saws become reduced in diameter by repeated sharpening.

When two sets of sawsare used alternately,

they will frequently differ widely in diameter, and it becomes necessary to adjust the whole feed mechanism rapidly to adapt it to large and small saws at short intervals. Turning the lever I and operating the pawl J efi'ects this adjustment instantl r IIO The entire train of feed The feed-chains carry the wood below or under the axes of the saws. In addition to the advantage in removing the saw when required, this is important to avoid lifting and flinging offthe wood by the motion ofthc saws. They move the wood in the same direction as the saws tend to carry it. This carries backward all the sawdust and loose material and keeps the work clean.

Modifications may bemadc in the details without departing from the principle or sacrificing the advantages of the invention. I can make the main framing A of cast-iron.

Parts of the invention may be used without the whole. I can dispense with the provision for carrying the arm past the dead-center and hold the belt-tightener by other means. Such would allow better for any stretching of the feed-belt Q; but the strain on this belt is slight and there need be but little stretch. I prefer to have ali the details about as shown.

I claim as my invention 1. In a sawing-macl'iine, a gang of circular saws, D, with means for driving them, in combination with a series of feed chains, M, arranged to carry the wood below the saws and in the same direction as the saws run, arranged for joint operation, as and for the purposes herein specified.

2. In a sawing-machine, as described, the combination, with a gang of saws, as D, hung on a single shaft, of a corresponding series of feed-chains carried on drums arranged parallel with the saw-arbor and revolved by the same power, the said chains being arranged to move in the same direction as the saws, as set forth.

3. In a sawing machine, as described, the combination, with the gang of saws D and the series of feedchains arranged to allow one chain to traverse the space between two adjzt cent saws, of a table, as G, and spring-guards secured to said table and arranged one be tween each adjacent pair of chains and extending beyond the drums, as set forth.

4. In a sawing machine, as described, a feeding device consisting of a series of chains led over revolving drums, the shaft of one drum being the pivot of an adjustable frame in which the other drum is journalcd, whereby the feed-chains may be thrown closer to or farther from the saw-arbor, to accommodate saws of different diameters, as set forth.

5. The combination, with the saws and their shaft B, of the frame G, pivoted on the shaft F and carrying near its free end a drum, K, of the chains M. having teeth m, the drum K, hung on the shaft F, and provisions for oscillating the frame G on its pivot, to throw the feed chains into desired relations with the saws at will, as specified.

G. In a sawing-machine, the combination, with a gang of saws supported on a common shaft, and with afeed-carricr operated by the same power, of a shaft, as E, carrying clearing-lingers E, a lever, E, rigid with said shaft, and a set-screw, E, for adjusting and holding the clearing-fingers in proper relations with the saws and carrier, as set forth.

7. In a sawing-machine, as described. the combination, with the gang of saws and with the frame G, pivoted on shaftF and carrying the feeding-chains M m, of the shaft I, having arm 1", the link H, connecting said arm with the carrier-frame G, and the lever l and awl J, for controlling the said shaft I, to adjust and hold the carrier in proper relation to the saws, as set forth.

8. In a sawing-machine, the combination, with the shaft B. the shaft F, and power connections, of the frame G, pivoted on shaft F, and carryii'ig-chains M and their drums K K, the shafts O and L, journaled in the frame G, the gears O K, connecting the shal'tsOF, and the belt Q and tightencr, all arranged to turn together on the center F without changing relation of parts, as specified.

9. In a sawing-machine, as described, the coinbiimtion, with the frame G and chain-carriers M. of the belt Qand tightener-pulley L, the lever arranged to stop the feed, the weight I and the link N, fand connections for throwingthe link past acenter to hold the weight and tightcner out of operation, as set forth.

In testimony whereof I have hereunto set my hand, at New York city, this 28th day of September, 1855, in the presence of two subscribing witnesses.

DARWIN A. GREENE.

Witnesses:

THOMAS DREW STETSON, M. F. BOYLE. 

